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Washed ashore, San Pedro, Los Angeles County, California.

In sublitoral zone, Carmel Bay, Monterey County, California.

On rocks, upper part of the litoral zone, western shores of Amaknak Island, Unalaska Bay, Alaska.

In the upper part of the sublitoral zone, on rocks, forming a zone, western shore of Amaknak Island, Unalaska Bay, Alaska.

On exposed rocks, in the lower litoral an upper sublitoral zones, Carmel Bay, Monterey County, California.

On rocks exposed to waves and spray, on bold shores, near Pacific Grove, California.

In somewhat sheltered places at low water mark, Spectacle Island, Penobscot Bay, Maine.

Between tide marks, chiefly in the upper littoral zone; fruiting in spring. Very abundant; Brigeport, Connecticut.

On rocks in thre upper part of the litoral zone, San Pedro, California.

Pacific Groves, Monterey County, California.

On rocks in upper litoral zone, Pacific Grove, California.

San Pedro, Los Angeles County, California.

On rocks, middle and lower litoral, San Pedro, California.

On exposed rocks at low water mark, Eagle Island, Penobscot Bay, Maine.

On rocks in the upper litoral zone, Point Cavallo, south of Sausalito, Marin County, California.

On rocks in littoral zone, Bridgeport.

Antheridial plants cast ashore, Redondo, California.

Common on stones near low water mark, Fort Point, Presidio, San Francisco, California.

On breakwater, San Pedro harbor, California.

On rocks in littoral zone, Bridgeport, Connecticut.

Oogonial plants growing on rocks exposed to heavy surf, in middle and lower litoral, White's Point, west of San Pedro, California.

Abundant and in many cases of large size, on stones, just below extreme low water mark, Pyramid Point, Monterey County, California.

On rocks on the litoral, Moss Beach, San Mateo County, California.

Cast ashore from the sublitoral, west coast of Whidbey Island, Washington.

On rocks, along tide line, San Pedro, California.

Rather local, in small patches on rocks, where the waves dash in, Land's End. San Francisco, California.

On stones near low water mark, in great abundance, Land's End, San Francisco, California.

On rocks in middle and lower litoral, Fort Point, San Francisco, California.

On rocks in middle and lower litoral, Fort Point, San Francisco, Calfornia.

In a stream, Casey, Illinois.

In a small pool Tamworth, New Hampshire.

In a roadside pool, Medford, Massachusetts.

Forming thin, dark purple sheets in ditches in a cranberry bog, Eastham, Massachusetts.

Pool near Lake Temescal, Berkeley, California.

In ditch by roadside, Mont Tamalpais, Marin County, California.

Among various filamentous algae, Charleston, Illinois.

In squeezings of plants from a small muddy pool, Eastham, Massachusetts.

In an aquarium, Oberlin College, Oberlin, Ohio.

Among Sphagnum in Lost Pond, Brookline, Massachusetts.

On wet boards and water pipes, West Berkeley, California.

On a log by mill dam, Beacon Falls, Connecticut.

Oberlin, Ohio.

Among other algae in a small pond near the shore, Tarpaulin Cove, Naushon, Elizabeth Island, Massachusetts.

With other small algae in submerged moss, Meshanticut Brook, Cranston, Rhode Island.

Among other algae in a small pond near the shore , Tarpaulin Cove, Naushon, Elizabeth Island, Massachusetts.

Wrightville Pond, Charleston, Illinois.

Charleston, Illinois.

Hodgdon's Pond, Charleston, Illinois.

Among other algae in a gelatinous mass on dripping rocks, The Cascade, Melrose, Massachusetts.

On rocks near San Francisco, California.